diff --git a/tests/storage/databases/main/test_room.py b/tests/storage/databases/main/test_room.py
new file mode 100644
index 0000000000..ffee707153
--- /dev/null
+++ b/tests/storage/databases/main/test_room.py
@@ -0,0 +1,98 @@
+# Copyright 2021 The Matrix.org Foundation C.I.C.
+#
+# Licensed under the Apache License, Version 2.0 (the 'License');
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# http://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an 'AS IS' BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+
+from synapse.rest import admin
+from synapse.rest.client import login, room
+from synapse.storage.databases.main.room import _BackgroundUpdates
+
+from tests.unittest import HomeserverTestCase
+
+
+class RoomBackgroundUpdateStoreTestCase(HomeserverTestCase):
+
+ servlets = [
+ admin.register_servlets,
+ room.register_servlets,
+ login.register_servlets,
+ ]
+
+ def prepare(self, reactor, clock, hs):
+ self.store = hs.get_datastore()
+ self.user_id = self.register_user("foo", "pass")
+ self.token = self.login("foo", "pass")
+
+ def _generate_room(self) -> str:
+ room_id = self.helper.create_room_as(self.user_id, tok=self.token)
+
+ return room_id
+
+ def test_background_populate_rooms_creator_column(self):
+ """Test that the background update to populate the rooms creator column
+ works properly.
+ """
+
+ # Insert a room without the creator
+ room_id = self._generate_room()
+ self.get_success(
+ self.store.db_pool.simple_update(
+ table="rooms",
+ keyvalues={"room_id": room_id},
+ updatevalues={"creator": None},
+ desc="test",
+ )
+ )
+
+ # Make sure the test is starting out with a room without a creator
+ room_creator_before = self.get_success(
+ self.store.db_pool.simple_select_one_onecol(
+ table="rooms",
+ keyvalues={"room_id": room_id},
+ retcol="creator",
+ allow_none=True,
+ )
+ )
+ self.assertEqual(room_creator_before, None)
+
+ # Insert and run the background update.
+ self.get_success(
+ self.store.db_pool.simple_insert(
+ "background_updates",
+ {
+ "update_name": _BackgroundUpdates.POPULATE_ROOMS_CREATOR_COLUMN,
+ "progress_json": "{}",
+ },
+ )
+ )
+
+ # ... and tell the DataStore that it hasn't finished all updates yet
+ self.store.db_pool.updates._all_done = False
+
+ # Now let's actually drive the updates to completion
+ while not self.get_success(
+ self.store.db_pool.updates.has_completed_background_updates()
+ ):
+ self.get_success(
+ self.store.db_pool.updates.do_next_background_update(100), by=0.1
+ )
+
+ # Make sure the background update filled in the room creator
+ room_creator_after = self.get_success(
+ self.store.db_pool.simple_select_one_onecol(
+ table="rooms",
+ keyvalues={"room_id": room_id},
+ retcol="creator",
+ allow_none=True,
+ )
+ )
+ self.assertEqual(room_creator_after, self.user_id)
diff --git a/tests/storage/test_event_push_actions.py b/tests/storage/test_event_push_actions.py
index 1930b37eda..bb5939ba4a 100644
--- a/tests/storage/test_event_push_actions.py
+++ b/tests/storage/test_event_push_actions.py
@@ -69,6 +69,7 @@ class EventPushActionsStoreTestCase(HomeserverTestCase):
event.room_id = room_id
event.event_id = "$test:example.com"
event.internal_metadata.stream_ordering = stream
+ event.internal_metadata.is_outlier.return_value = False
event.depth = stream
self.get_success(
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